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Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 963042, 6 pages
http://dx.doi.org/10.1155/2014/963042
Research Article

Fabrication of Porous and Nanoporous Aluminum via Selective Dissolution of Al-Zn Alloys

1General Engineering Department, University of Puerto Rico, P.O. Box 9000, Mayagüez, PR 00681, USA
2Mechanical Engineering Department, University of Puerto Rico, P.O. Box 9000, Mayagüez, PR 00681, USA
3Theoretical and Applied Mechanics Program, Northwestern University, 633 Clark Street, Evanston, IL, USA
4Chemical Engineering Department, University of Puerto Rico, P.O. Box 9000, Mayagüez, PR 00681, USA

Received 8 March 2014; Revised 12 July 2014; Accepted 12 July 2014; Published 24 August 2014

Academic Editor: Yucel Birol

Copyright © 2014 Oscar Marcelo Suárez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Porous and nanoporous aluminum have been fabricated via selective dissolution. Al-Zn alloys were dealloyed in an aqueous solution of nitric acid to selectively dissolve zinc. Fast solidification methods permitted to adjust the precursor microstructure of the parent alloy in order to induce supersaturation of zinc in aluminum. An electric potential applied during corrosion affected the final morphology of porosity. Electronic imaging evinced the presence of regions with less than 100 nm diameter pores. This nanoporosity was only present in electrochemically dealloyed samples. We observed two types of porosity in dealloyed samples: a primary porosity resulting from the selective removal of zinc-rich interdendritic phases and a secondary porosity resulting from nanoporosity evolution inside zinc-supersaturated dendrites.